In summer， sun-shade is essential for building energy conservation. Using green plants as a sun-shade material is an effective way to protect windows from solar radiation， save building energy and improve the environment. This design bases on the observing of window sill greening which plant by residents spontaneously and advances to a movable green plants sun-shade component on windows. The improvement makes the component become an adjustable ecological energy saving measure， which could meet the requirements of natural lighting and ventilating. Through the experimental data， we can find out that the awning window shading coefficient can reach to 0.1 ~ 0.2， and sun radiation heat can be kept out by 80%~90%.